

🔧 Seal it once, trust it forever.
Sikaflex-221 is a top-tier, fast-curing one-component polyurethane sealant and adhesive delivering permanent elastic bonds across multiple surfaces. Renowned for its durability, weather resistance, and NSF approval, it’s the go-to choice for professionals demanding reliable, flexible sealing in automotive, construction, and industrial applications.










| ASIN | B00O9VFLRS |
| Best Sellers Rank | #5,698 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #47 in Hardware Sealers |
| Brand Name | SIKA |
| Color | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,501) |
| Global Trade Identification Number | 00338860050980 |
| Included Components | AP Products 017-90891 Sikaflex-221, White |
| Item Form | Paste |
| Item Type Name | AP Products 017-90891 Sikaflex-221, White |
| Item Weight | 10.1 Ounces |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | SIKA |
| Material Type | Polyurethane |
| Surface Recommendation | Roof, Vent, Pipe |
| UPC | 338860050980 |
| Unit Count | 10.1 Fluid Ounces |
| Water Resistance Level | Waterproof |
O**A
I used Sikaflex to adhere a roof wing to the back windshield of my car, and I’m seriously impressed with how well it worked. The bond is incredibly strong and feels permanent once cured. I let it set for about 24 hours before driving, and even after months of highway speeds and temperature changes, the wing hasn’t budged at all. The application was pretty straightforward, it has a thick, tacky consistency that gives you enough working time to position everything correctly before it starts to set. I’d recommend taping or clamping the part in place while it cures, because it does take a while to fully harden. Once cured, it’s flexible enough to handle vibration and movement, which is great for automotive use. One thing to note: this stuff is messy. It’s sticky, and once it gets on your hands or paint, it’s not easy to remove. Wear gloves, mask off surrounding areas, and have some cleaner or mineral spirits ready. Overall, Sikaflex delivered exactly what I needed, a strong, weatherproof, and vibration resistant bond that’s holding my roof wing securely in place. It’s not the cheapest adhesive, but it’s worth it for the strength and reliability.
H**M
Very good
A**X
Buen sellador excelente para celular y buena. Marca
K**Y
Great brand always works
T**S
I needed some good adhesive to attach solar panels to my camper and a lot of places recommended this stuff so I decided to give it a shot. It applies just like any other adhesives, pretty straight forward, and when used as instructed it creates a very nice bond between two materials. I was wary at first driving down the highway on first test run paranoid the wind was going to rip them off, and after a couple summers with highway driving, I am now confident in the quality of the item. It does what it is intended for. Would, and have, bought this again.
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